docs(example-ssr): use cjs imports (#3657)

<!--
  Thanks for submitting a pull request!
Please provide enough information so that others can review your pull
request.
-->

**Summary**

The example is ran using node without esm, and webpack also isn't set up
for proper esm, so this errors in modern node (14+) if we use esm.

Setting up for proper esm (type module etc) wouldn't be representative
for most users, so we'll fall back to cjs

CR-2214

<!--
  Explain the **motivation** for making this change.
  What existing problem does the pull request solve?
  Are there any linked issues?
-->

**Result**

<!--
  Demonstrate the code is solid.
  Example: The exact commands you ran and their output,
  screenshots / videos if the pull request changes UI.
-->

using cjs imports in hooks-ssr example

Co-authored-by: Dhaya <154633+dhayab@users.noreply.github.com>

Author: Haroenv

examples/hooks-ssr/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+  rules: {
+    // this example is using CJS
+    'no-restricted-imports': 'off'
+  }
+}

examples/hooks-ssr/src/App.js

@@ -10,8 +10,13 @@ import {
   RefinementList,
   SearchBox,
 } from 'react-instantsearch-hooks-web';
-import { simple } from 'instantsearch.js/es/lib/stateMappings';
-import { history } from 'instantsearch.js/es/lib/routers';
+// because this is ran on node without type: "module" set in the package.json
+// we need to use commonjs instead of esm.
+// If you use ESM in Node, you can rely on these import statements instead:
+// import { simple } from 'instantsearch.js/es/lib/stateMappings';
+// import { history } from 'instantsearch.js/es/lib/routers';
+import { simple } from 'instantsearch.js/cjs/lib/stateMappings';
+import { history } from 'instantsearch.js/cjs/lib/routers';
 
 import { searchClient } from './searchClient';